Parasitology Research

, Volume 111, Issue 4, pp 1661–1671 | Cite as

The effects of a parasitic copepod on the recent larval growth of a fish inhabiting rocky coasts

  • Pamela Palacios-Fuentes
  • Mauricio F. Landaeta
  • Gabriela Muñoz
  • Guido Plaza
  • F. Patricio Ojeda
Original Paper

Abstract

Parasites can infect larval, juvenile or adult marine fishes; however, the effects of parasites on the growth and condition of fish larvae have seldom been investigated. This study analysed the effects of a parasitic copepod on the larval growth of the Chilean triplefin Helcogrammoides chilensis (Tripterygiidae) based on the microstructure of the sagittal otoliths. Fish larvae were collected during the austral spring of 2010 off central Chile. Their body length ranged from 5.1 to 16.6 mm (2 to 57 days old). They were parasitised by a penellid larval copepod that was always externally attached to the ventral side of the fish’s gut. The prevalence of the copepod ranged from 2.7 % to 20.8 %, with one to four parasites per fish larva. Relationships between otolith size (radius, perimeter) and larval size were equal for parasitised and unparasitised fish larvae (P > 0.05). Larval growth was also similar for unparasitised (0.21 mm/day) and parasitised fish larvae (0.19 mm/day) (P > 0.05). However, a comparison of same-aged larvae showed that the larvae with copepods were smaller in both length and estimated body volume than the larvae without copepods. The Recent Otolith Growth Index, indicated that larval H. chilensis with copepods showed a reduction in recent growth and condition compared with those without evidence of copepods (P < 0.05). Nevertheless, a higher parasite load (two vs. one pennellids) did not decrease the condition of the larval fish. The infestation of pennellids on coastal fish larvae may therefore induce an increase in the pelagic larval duration and potentially affect the settlement rates of this intertidal fish.

Notes

Acknowledgments

The authors thank J. Contreras, C. Cortez, F. Salas-Berrios and R. Finke for their field work aboard RV Ilan, and we thank M. Palacios and C. Fuentes for their constant support. We also thank R. Castro (Universidad de Antofagasta) for his help with the identification of the ectoparasite and S. Goyen for her assistance with the revision of the English manuscript. This research was funded by Fondecyt 1100424 awarded to FPO, GP and MFL. The drawings were made by C. Cortez.

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Pamela Palacios-Fuentes
    • 1
  • Mauricio F. Landaeta
    • 1
  • Gabriela Muñoz
    • 2
  • Guido Plaza
    • 3
  • F. Patricio Ojeda
    • 4
  1. 1.Laboratorio de Ictioplancton (LABITI), Facultad de Ciencias del Mar y de Recursos NaturalesUniversidad de ValparaísoViña del MarChile
  2. 2.Laboratorio de Parasitología, Facultad de Ciencias del Mar y de Recursos NaturalesUniversidad de ValparaísoViña del MarChile
  3. 3.Escuela de Ciencias del MarPontificia Universidad Católica de ValparaísoValparaísoChile
  4. 4.Facultad de Ciencias BiológicasPontificia Universidad Católica de ChileSantiagoChile

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